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Emergency freshwater circuit
Manufacturing components
Pipe elbow (1) is available as a spare part. Pipe elbow
(4) is available as a spare part for engines with radiator
cooling systems.
1. Drill a hole in extra pipe elbow (1) and weld on a
pipe elbow (2) with an internal diameter of 60 mm
(2.36”) as illustrated. The hole in the pipe elbow to
the ordinary seawater pump is sealed with a
washer (3) welded onto the elbow (1).
2. Install pipe elbow (4) with seal at lower pump hole.
Make the other necessary pipes.
3. Cut two hoses to the right length (5). Use two hose
clamps on either end of the hoses.
Installation
1. Drain engine coolant in the freshwater system if
possible. Otherwise remove sealing cover at the
bottom where pipe (4) is to be installed.
Be careful of hot engine coolant, there is
a danger of burns.
2. Remove the existing pipe elbow and install the
new one (1) as illustrated.
3. Install pipes and hoses to the extra pump (7).
The extra pump must have a capacity of at
least 200 liters (44 Imp. gals/52.8 US gals) per
minute and a maximum of 600 liters (132 Imp.
gals/158.4 US gals) per minute.
4. Close the drain cocks. Fill with engine coolant and
start pump and engine.
Emergency operation, engine
coolant system
Certain classification organizations prescribe that it
should be possible to replace the seawater and fresh-
water pumps temporarily.
This relatively easy to do as follows. The scavenger
pump can be used as a temporary engine coolant pump
in emergencies. Otherwise a separate pump mounted
by the engine must be available.
The following components must be obtained by the boat
owner, Volvo Penta does not keep them in stock.
Emergency seawater circuit.
The piping for an emergency seawater circuit is as illus-
trated. The scavenger pump can then be used as a
seawater pump. Internal pipe diameter 54 mm (2").
Close sea cock before working on seawater
cooling system.
1. Undo clamp (1) on water pipe.
2. Connect hoses and pipes as illustrated. Use two
hose clamps on either end of the hoses. Tighten
connections properly.
3. Open the sea cock and check for leaks.
Emergency freshwater circuit
1. Pipe elbow
2. Pipe to be welded (internal diameter 60 mm (2.36")
3. Seal inside elbow.
4. Lower pipe elbow
5. Hose clamps (length approx. 200 mm (7.87")
6. Ordinary circulation pump
7. Extra circulation pump or scavenger pump.
Emergency seawater circuit
1. Clamp
2. Scavenger pump
3. Ordinary seawater pump
4. Seawater from seawater filter
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